US president Donald Trump is facing legal challenges to his “extreme vetting” order, which freezes immigration from seven Muslim-majority countries and temporarily bans refugees. Elsewhere, a lesser publicised but highly significant drama is taking place. And it could undermine the legitimacy of Trump’s presidency. In December, the Russian security service arrested four senior cybersecurity experts as a result of an investigation into the hacking of US Democratic Party emails. The arrests could see further evidence revealed that explains how that hacking helped Trump to win the presidency. It could also provide Russian President Vladimir Putin with another ‘blackmail’ lever to use against Trump. Meanwhile, a former KGB chief has been found dead under mysterious circumstances.